As stated in the Canada Health Infoway press release here, benefits of a DI-R are

Enables diagnostic images and reports to be shared between facilities, eliminating the need for patients to transport images and reports between doctors on CDs, films, or by fax.

It also allows specialists at one facility to access the reports for images acquired at other hospitals allowing for faster and more convenient information sharing between doctors. This improved access to patient information will help health care providers make more informed and timely medical decisions.